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// { dg-do run { target *-*-freebsd* *-*-netbsd* *-*-linux* *-*-solaris* *-*-cygwin *-*-darwin* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }
// { dg-options " -std=gnu++0x -pthread" { target *-*-freebsd* *-*-netbsd* *-*-linux* alpha*-*-osf* mips-sgi-irix6* powerpc-ibm-aix* } }
// { dg-options " -std=gnu++0x -pthreads" { target *-*-solaris* } }
// { dg-options " -std=gnu++0x " { target *-*-cygwin *-*-darwin* } }
// { dg-require-cstdint "" }
// { dg-require-gthreads "" }
 
// Copyright (C) 2010, 2011, 2012 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
 
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.
 
 
#include <mutex>
#include <thread>
#include <testsuite_hooks.h>
 
void locker(std::mutex& m1, std::mutex& m2, std::mutex& m3)
{
  bool test __attribute__((unused)) = true;
 
  typedef std::unique_lock<std::mutex> lock_type;
 
  lock_type l1(m1, std::defer_lock);
  lock_type l2(m2, std::defer_lock);
  lock_type l3(m3, std::defer_lock);
  std::lock(l1, l2, l3);
  VERIFY( l1.owns_lock() );
  VERIFY( l2.owns_lock() );
  VERIFY( l3.owns_lock() );
}
 
void test01()
{
  std::mutex m1, m2, m3;
  std::thread t1(locker, std::ref(m1), std::ref(m2), std::ref(m3));
  std::thread t2(locker, std::ref(m3), std::ref(m2), std::ref(m1));
  t1.join();
  t2.join();
}
 
int main()
{
  test01();
  return 0;
}